BCC: Dr K, VMP, IM - any thoughts on HEPA filter sources and/or my advice.

> I'm considering putting together a very simple HEPA filter air purifier f=
or
> my apartment. Just a simple fan and filter design. Nothing fancy. Cheap a=
s
> possible.

The term "HEPA filter" is a bit too generic to be useful. But a real
HEPA filter fails your spec on 3 counts.

Not cheap.
Not not fancy.
Not simple

Anything DESIGNED to filter out particles far smaller than its pore
size tends to demand respect and $.

        http://en.wikipedia.org/wiki/HEPA

You can however do various things which come "close enough" at OK [tm] pric=
e.

Airliners (they say) do HEPA filtration on cabin air.
Some trick - but whatever they do use would almost certainly offer
excellent performance per size.

You can buy water filter elements at about the 1 to 2 micron rating.
These would be a good start.

If attempting to filter air incoming to flat:      Unless you are
specifically intending to ward off a local biological attack or to be
safe from European vegetables it is probably unwise to live too much
of your life in a HEPA filtered environment. In the real world you
probably do better off eating dirt from an early age and not being too
too fastidious about hygiene. (Too fastidious is OK). Exposure to
various pathogens encourages your body to fend for itself (as they
presumably have or will taught/teach you). The more greeblies you hide
from the more likely it is that one you do meet will harm you. Within
reason.

If object is to filter vacuum outlet dust  then something less than
HEPA will help. The really enthused may decide to fit a cyclonic
separator which can offer results indistinguishable from magic when
used in conjunction  with a fairly modest filter.

             Russell




>
> Does anyone know where I can get cheap large HEPA filters?
>
> At the very least, I want some so I can cut them to shape and stick them =
on
> to the exhaust of my vacuum cleaner.
--=20
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